The new dithiolato ligand with an extended pi-electron system, C8H4S82-(2-[(4,5-ethylenedithio)-1,3-dithiole-2-ylidene]-1,3-dithiole-4,5-dithiolate) was synthesized and [NBu(4)(n)][Au(C8H4S8)(2)] and Pt(C8H4S8)-(SEt(2))(2) prepared. Redox potentials of these complexes were determined. Their oxidized species and Na-1.5[Ni(C8H4S8)(2)] exhibit electrical conductivities of 0.06 - 17 S cm(-1) at room temperature for compacted pellets.